1321213111 has 2 divisors, whose sum is σ = 1321213112. Its totient is φ = 1321213110.

The previous prime is 1321213093. The next prime is 1321213129. The reversal of 1321213111 is 1113121231.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1321213093) and next prime (1321213129).

It is an emirp because it is prime and its reverse (1113121231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321213111 - 2¹⁹ = 1320688823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321213171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660606555 + 660606556.

It is an arithmetic number, because the mean of its divisors is an integer number (660606556).

Almost surely, 2^1321213111 is an apocalyptic number.

1321213111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321213111 is an equidigital number, since it uses as much as digits as its factorization.

1321213111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 16.

The square root of 1321213111 is about 36348.4953058583. The cubic root of 1321213111 is about 1097.2972519969.

Adding to 1321213111 its reverse (1113121231), we get a palindrome (2434334342).

The spelling of 1321213111 in words is "one billion, three hundred twenty-one million, two hundred thirteen thousand, one hundred eleven".